磁流变抛光液的研制、表征及使用

Development,characterization,and verification of magnetorheological polishing fluids

针对现有抛光技术的不足,研究将磨料颗粒包覆在铁磁性颗粒表面,制备出磨料颗粒与铁磁性颗粒的复合粒子,并由此制备磁流变抛光液。通过扫描电镜观察,表明磨料较为均匀地包覆于铁磁性颗粒表面;利用流变仪测试磁流变抛光液的流变性,当磁场为0.8 T、剪切速率为100 s-1时,剪切应力达到45 kPa。通过智能磁流变抛光机对两款316L材质的金属粉末注射成形冷饮机配件进行抛光实验,验证磁流变抛光液的抛光效果,结果表明,抛光后粉末注射成形配件的表面粗糙度明显下降,说明所研制的磁流变抛光液对于粉末冶金制品表面粗糙度具有较高的去除率。

To overcome the deficiency of existing polishing technology, the magnetorheological(MR) polishing fluid was prepared by the abrasive and ferromagnetic composite particles, using the abrasive particles coated on the ferromagnetic particle surfaces. The morphology of the abrasive and ferromagnetic composite particles was observed by scanning electron microscopy, the rheological property of MR fluids was tested by Rheometer, and the effect of MR polishing fluid on 316 L metal powder injection molding parts was verified by polishing experiment in intelligent magnetorheological polishing machine. In the results, the abrasive particles are evenly wrapped around the ferromagnetic particle surfaces. When the magnetic field is 0.8 T and the shearing rate is 100 s-1, the shear stress reaches 45 kPa. The surface roughness of 316 L metal powder injection molding parts polished by MR polishing fluid decreases significantly, showing that the magnetorheological polishing solution has the high removal rate for the surface roughness of powder metallurgy products.